10.1021/ie3019643.s001Eric A. MorrisRex ChoiTi OuyangCharles Q. JiaConstant Thickness Porous
Layer Model for Reaction
between Gas and Dense Carbonaceous Materials2012American Chemical Societylayer thicknesstime dependenceConstant Thickness Porous Layer Modelmaterialpore size distributionparticle sizemodelcarbon gasification reactionRandom Pore ModelSSA2012-11-07 00:00:00articlehttps://acs.figshare.com/articles/Constant_Thickness_Porous_Layer_Model_for_Reaction_between_Gas_and_Dense_Carbonaceous_Materials/2471236Using oil-sands petroleum coke as the raw material and
sulfur dioxide
as the activating agent at 700 °C, the process of pore development
in dense carbonaceous materials was studied. The time dependence of
porosity was established from measured values of specific surface
area (SSA), which could not be explained using conventional porous
layer theories. Incorporating the Random Pore Model with measurements
of particle size and porous layer thickness, a model was developed
based on the existence of a porous layer of constant thickness. The
model was found to accurately reproduce experimental time dependence
of SSA. The results confirm a constant thickness of the porous layer
for the activation conditions studied, which results from competing
effects of carbon gasification reaction and penetration of the activating
agent into the carbon particle interior. The model predicts a higher
achievable SSA for a greater constant porous layer thickness, smaller
initial particle size, and lower inorganic ash content. This model
was found to be useful in predicting the maximum porous layer thickness
of a dense material undergoing activation or gasification using only
measured values of SSA, pore size distribution, and particle size
as inputs.